package com.imooc.service.impl;

import com.imooc.converter.OrderMaster2OrderDTOConverter;
import com.imooc.dataobject.OrderDetail;
import com.imooc.dataobject.OrderMaster;
import com.imooc.dataobject.ProductInfo;
import com.imooc.dto.CarDTO;
import com.imooc.dto.OrderDTO;
import com.imooc.enums.OrderStatusEnum;
import com.imooc.enums.PayStatusEnum;
import com.imooc.enums.ResultEnum;
import com.imooc.exception.SellException;
import com.imooc.repository.OrderDetailRepository;
import com.imooc.repository.OrderMasterRepository;
import com.imooc.service.OrderService;
import com.imooc.service.ProductService;
import com.imooc.service.PushMessageService;
import com.imooc.service.WebSocket;
import com.imooc.utils.KeyUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageImpl;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class OrderServiceImpl implements OrderService {
    @Autowired
    private ProductService productService;

    @Autowired
    private OrderDetailRepository orderDetailRepository;

    @Autowired
    private OrderMasterRepository orderMasterRepository;

    @Autowired
    private PushMessageService pushMessageService;

    @Autowired
    private WebSocket webSocket;

    @Override
    @Transactional
    public OrderDTO create(OrderDTO orderDTO) {
        String orderId=KeyUtil.genUniqueKey();
        BigDecimal orderAmount=new BigDecimal(BigInteger.ZERO);
//        List<CarDTO> carDTOList=new ArrayList<>();

        //1.查询商品（数量，价格）
        for(OrderDetail orderDetail:orderDTO.getOrderDetailList()){
            ProductInfo productInfo=productService.findOne(orderDetail.getProductId());
            if(productInfo==null){
                log.info("【创建订单】商品不存在，请检查商品id={}",orderDetail.getProductId());
                throw new SellException(ResultEnum.product_not_exist);
            }
            //2.计算订单总价
           orderAmount=productInfo.getProductPrice().multiply(new BigDecimal(orderDetail.getProductQuantity())).add(orderAmount);
            //订单详情入库
            //属性拷贝
            BeanUtils.copyProperties(productInfo,orderDetail);
            orderDetail.setDetailId(KeyUtil.genUniqueKey());
            orderDetail.setOrderId(orderId);

            orderDetailRepository.save(orderDetail);

//            CarDTO carDTO=new CarDTO(orderDetail.getProductId(),orderDetail.getProductQuantity());
//            carDTOList.add(carDTO);

        }


        //3.写入订单数据库（orderMaster和orderDetail）
        OrderMaster orderMaster=new OrderMaster();
        orderDTO.setOrderId(orderId);
        BeanUtils.copyProperties(orderDTO,orderMaster);
        orderMaster.setOrderAmount(orderAmount);
        orderMaster.setOrderStatus(OrderStatusEnum.NEW.getCode());
        orderMaster.setPayStatus(PayStatusEnum.WAIT.getCode());
        orderMasterRepository.save(orderMaster);

        //4.扣库存
        List<CarDTO> carDTOList=new ArrayList<>();
        carDTOList=orderDTO.getOrderDetailList().stream().
                map(e->new CarDTO(e.getProductId(),e.getProductQuantity())).collect(Collectors.toList());
        productService.decreaseStock(carDTOList);

        //发送websocket消息
        webSocket.sendMessage("有新的订单");
        return orderDTO;
    }

    @Override
    public OrderDTO findOne(String orderId) {
       OrderMaster orderMaster= orderMasterRepository.findOne(orderId);
       if(orderMaster==null){
           throw new SellException(ResultEnum.ORDER_NOT_EXIST);
       }
       List<OrderDetail> orderDetailList=orderDetailRepository.findByOrderId(orderId);
       if(CollectionUtils.isEmpty(orderDetailList)){
           throw new SellException(ResultEnum.ORDERDETAIL_NOT_EXIST);
       }
       OrderDTO orderDTO=new OrderDTO();
       BeanUtils.copyProperties(orderMaster,orderDTO);
       orderDTO.setOrderDetailList(orderDetailList);

       return orderDTO;
    }

    @Override
    public Page<OrderDTO> findList(String buyerOpenid, Pageable pageable) {
        Page<OrderMaster> orderMasterPage=orderMasterRepository.findByBuyerOpenid(buyerOpenid,pageable);

        List<OrderDTO> orderDTOList=OrderMaster2OrderDTOConverter.convert(orderMasterPage.getContent());
        Page<OrderDTO> orderDTOPage=new PageImpl<OrderDTO>(orderDTOList,pageable,orderMasterPage.getTotalElements());

        return orderDTOPage;
    }

    @Override
    @Transactional
    public OrderDTO cancel(OrderDTO orderDTO) {
        OrderMaster orderMaster=new OrderMaster();


        //判断订单状态
        if(!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())){
            log.error("【取消订单】订单状态不正确，orderId={},orderStatus={}",orderDTO.getOrderId());
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);

        }
        //修改订单状态
        orderDTO.setOrderStatus(OrderStatusEnum.CANCEL.getCode());
        BeanUtils.copyProperties(orderDTO,orderMaster);
        OrderMaster updateOrderMaster=orderMasterRepository.save(orderMaster);
        if (updateOrderMaster==null){
            log.error("【取消订单】更新失败，orderMaster={}",orderMaster);
            throw new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }

        //返还库存
        if(CollectionUtils.isEmpty(orderDTO.getOrderDetailList())){
            log.error("【取消订单】订单无商品详情，orderDTO={}",orderDTO);
            throw new SellException(ResultEnum.ORDER_DETAIL_EMPTY);
        }
        List<CarDTO> carDTOList=orderDTO.getOrderDetailList().stream()
                .map(e->new CarDTO(e.getProductId(),e.getProductQuantity())).collect(Collectors.toList());
        productService.increaseStock(carDTOList);

        //如果已支付，需要退款
        if(orderDTO.getPayStatus().equals(PayStatusEnum.SUCCESS.getCode())){
            //TODO

        }
        return orderDTO;
    }

    @Override
    @Transactional
    public OrderDTO finish(OrderDTO orderDTO) {
        //判断订单状态
        if(!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())){
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }

        //修改订单壮状态
        orderDTO.setOrderStatus(OrderStatusEnum.FINISHED.getCode());
        OrderMaster orderMaster=new OrderMaster();
        BeanUtils.copyProperties(orderDTO,orderMaster);
        OrderMaster updateResult=orderMasterRepository.save(orderMaster);
        if (updateResult==null){
            log.error("【完成订单】更新失败，orderMaster={}",orderMaster);
            throw new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }

        //完成订单，推送微信模版消息
        pushMessageService.orderStatus(orderDTO);

        return orderDTO;
    }

    @Override
    @Transactional
    public OrderDTO paid(OrderDTO orderDTO) {
        //判断订单状态
        if(!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())){
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }

        //判断支付状态
        if(!orderDTO.getPayStatus().equals(PayStatusEnum.WAIT.getCode())){
            throw new SellException(ResultEnum.ORDER_PAY_STATUS_ERROR);
        }

        //修改支付状态
        orderDTO.setPayStatus(OrderStatusEnum.FINISHED.getCode());
        OrderMaster orderMaster=new OrderMaster();
        BeanUtils.copyProperties(orderDTO,orderMaster);
        OrderMaster updateResult=orderMasterRepository.save(orderMaster);
        if (updateResult==null){
            log.error("【取消订单】更新失败，orderMaster={}",orderMaster);
            throw new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }
        return orderDTO;

    }

    @Override
    public Page<OrderDTO> findList(Pageable pageable) {
        Page<OrderMaster> orderMasterPage=orderMasterRepository.findAll(pageable);
        List<OrderDTO> orderDTOList=OrderMaster2OrderDTOConverter.convert(orderMasterPage.getContent());
        Page<OrderDTO> orderDTOPage=new PageImpl<OrderDTO>(orderDTOList,pageable,orderMasterPage.getTotalElements());
        return orderDTOPage;
    }
}
